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Date: Mon, 27 Apr 2020 13:51:26 +0800 From: Jason Wang <jasowang@...hat.com> To: Jesper Dangaard Brouer <brouer@...hat.com>, sameehj@...zon.com Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, zorik@...zon.com, akiyano@...zon.com, gtzalik@...zon.com, Toke Høiland-Jørgensen <toke@...hat.com>, Daniel Borkmann <borkmann@...earbox.net>, Alexei Starovoitov <alexei.starovoitov@...il.com>, John Fastabend <john.fastabend@...il.com>, Alexander Duyck <alexander.duyck@...il.com>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, David Ahern <dsahern@...il.com>, Willem de Bruijn <willemdebruijn.kernel@...il.com>, Ilias Apalodimas <ilias.apalodimas@...aro.org>, Lorenzo Bianconi <lorenzo@...nel.org>, Saeed Mahameed <saeedm@...lanox.com>, steffen.klassert@...unet.com Subject: Re: [PATCH net-next 19/33] tun: add XDP frame size On 2020/4/23 上午12:08, Jesper Dangaard Brouer wrote: > The tun driver have two code paths for running XDP (bpf_prog_run_xdp). > In both cases 'buflen' contains enough tailroom for skb_shared_info. > > Cc: Jason Wang <jasowang@...hat.com> > Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com> Acked-by: Jason Wang <jasowang@...hat.com> > --- > drivers/net/tun.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c > index 44889eba1dbc..c54f967e2c66 100644 > --- a/drivers/net/tun.c > +++ b/drivers/net/tun.c > @@ -1671,6 +1671,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun, > xdp_set_data_meta_invalid(&xdp); > xdp.data_end = xdp.data + len; > xdp.rxq = &tfile->xdp_rxq; > + xdp.frame_sz = buflen; > > act = bpf_prog_run_xdp(xdp_prog, &xdp); > if (act == XDP_REDIRECT || act == XDP_TX) { > @@ -2411,6 +2412,7 @@ static int tun_xdp_one(struct tun_struct *tun, > } > xdp_set_data_meta_invalid(xdp); > xdp->rxq = &tfile->xdp_rxq; > + xdp->frame_sz = buflen; > > act = bpf_prog_run_xdp(xdp_prog, xdp); > err = tun_xdp_act(tun, xdp_prog, xdp, act); > >
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